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Business Combinations (Details) $ in Millions		6 Months Ended
	Jul. 01, 2019 USD ($)	Jun. 30, 2019 USD ($) acquisition	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Number of Businesses Acquired | acquisition		2
Payments to Acquire Businesses	$ 1,800.0	$ 28.3
Cash Acquired from Acquisition		3.8
Business Combinations, Guaranteed Deferred Acquisition Obligation		6.5	$ 0.0
Business Combination, contingent earn-out consideration		1.5	$ 1.7
Goodwill, Acquired During Period		39.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		10.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		(4.7)
Redeemable Noncontrolling Interest		$ 8.5		$ 0.0	$ 3.8
Document Period End Date		Jun. 30, 2019
Payment for Contingent Consideration Liability, Total		$ 45.5
Goodwill, Purchase Accounting Adjustments		1.0
Intangible Assets, Current		0.5
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles		(1.5)
Net of NCI Income [Member]
Business Acquisition [Line Items]
Redeemable Noncontrolling Interest		$ 8.4

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